GB875998A - Improvements in or relating to case-hardening - Google Patents

Improvements in or relating to case-hardening

Info

Publication number
GB875998A
GB875998A GB39496/58A GB3949658A GB875998A GB 875998 A GB875998 A GB 875998A GB 39496/58 A GB39496/58 A GB 39496/58A GB 3949658 A GB3949658 A GB 3949658A GB 875998 A GB875998 A GB 875998A
Authority
GB
United Kingdom
Prior art keywords
hardening
case
mixture
relating
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB39496/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bergwerksverband GmbH
Original Assignee
Bergwerksverband GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bergwerksverband GmbH filed Critical Bergwerksverband GmbH
Publication of GB875998A publication Critical patent/GB875998A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

A method of case hardening comprises adding to the case-hardening furnace a mixture consisting of aliphatic alcohols containing one or two carbon atoms, alcohols with three or more carbon atoms, and at least 5% of pyridine The mixture preferably contains 60-100 parts by weight of oxygen per 100 parts by weight of carbon, and, if insufficient oxygen is present in the mixture, up to 5% water may be added. After carburizing and quenching, the workpieces may be heated to 800 DEG C. to 1000 DEG C. and quenched to obtain further hardening.
GB39496/58A 1957-12-06 1958-12-08 Improvements in or relating to case-hardening Expired GB875998A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE875998X 1957-12-06

Publications (1)

Publication Number Publication Date
GB875998A true GB875998A (en) 1961-08-30

Family

ID=6817519

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39496/58A Expired GB875998A (en) 1957-12-06 1958-12-08 Improvements in or relating to case-hardening

Country Status (1)

Country Link
GB (1) GB875998A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042428A (en) * 1975-02-28 1977-08-16 Kabushiki Kaisha Fujikoshi Process for hardening iron-containing surfaces with organic solvent and ammonia
US4154629A (en) * 1975-12-23 1979-05-15 Kabushiki-Kaisha Fujikoshi Process of case hardening martensitic stainless steels
EP1544318A1 (en) * 2002-07-09 2005-06-22 Langen Li Atmosphere heat treatment cocatalyst, method of its application, heat treatment method and heat treatment atmosphere of using the cocatalyst

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042428A (en) * 1975-02-28 1977-08-16 Kabushiki Kaisha Fujikoshi Process for hardening iron-containing surfaces with organic solvent and ammonia
US4154629A (en) * 1975-12-23 1979-05-15 Kabushiki-Kaisha Fujikoshi Process of case hardening martensitic stainless steels
EP1544318A1 (en) * 2002-07-09 2005-06-22 Langen Li Atmosphere heat treatment cocatalyst, method of its application, heat treatment method and heat treatment atmosphere of using the cocatalyst
EP1544318A4 (en) * 2002-07-09 2008-12-31 Langen Li Atmosphere heat treatment cocatalyst, method of its application, heat treatment method and heat treatment atmosphere of using the cocatalyst

Similar Documents

Publication Publication Date Title
GB1435684A (en) Magnetic materials
GB933843A (en) Columbium containing steels
GB875998A (en) Improvements in or relating to case-hardening
GB1303743A (en)
GB1003705A (en) Process for the after-treatment of phosphate coatings
GB1253740A (en) Heat treatment of high tensile bainitic steel
SE7602838L (en) SALT BATH FOR BIG COOLING OF BATH-NITRATED CONSTRUCTION ELEMENTS
GB1018702A (en) Method of producing steel with improved properties
GB851346A (en) Process of nitriding hardenable steel
GB924706A (en) Alloy steels and articles made therefrom
GB1042612A (en) Improvements in or relating to articles of boron-containing steels
GB840612A (en) Method of surface hardening cast-iron
GB912965A (en) Improvements in or relating to the preparation of steroids
GB1044566A (en) Improvements in or relating to the manufacture of steel balls
GB835356A (en) Improvements in or relating to a method of producing needle roller bearings
JPS5229418A (en) Heat resisting steel
GB480870A (en) Improvements in or relating to the case hardening of iron and steel
GB794806A (en) Improvements in or relating to the surface treatment of clutch discs
GB1325198A (en) Process of heat treating nickelbearing steel and steel stock produced thereby
GB837932A (en) Process for carburising and carbonitriding iron and steel
GB912018A (en) Nitriding process
GB1010189A (en) Method of treating steel
GB858404A (en) A method of lowering the carbon content of chromium-bearing steels
GB960174A (en) Improvements in the production of hard steel particles
GB819741A (en) A method of enriching water with fluorine compounds